Sharpless 237 (NGC 1931, LBN 810, the fly nebula and others) is a small emission and reflection nebula located approximately 7,000 light-years away in Auriga.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged January 7th, 11th and 12th, 2017 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.
LRGB - https://www.flickr.com/photos/dcrowson/39692092151/sizes/l
I also spent three nights collecting twelve hours of Ha data but it didn’t add anything to the image.